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Posted: 5/31/2005 6:17:41 PM EDT
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The other day I was out burning up some ammo that was a little on the wimpy side. Every now and then I’d get one that wouldn’t completely operate the bolt/carrier and I’d get a bent cartridge. I ejected these all by hand and later picked them up figuring I’d single load them so I could reuse the brass. I stuck the first one in the chamber as best I could and let the bolt fly and BANG!! I tried it again and same thing BANG!! Somewhere in the back of my head, I remember hearing something about letting the bolt go while holding the trigger back so I tried it, no problem at all with the next couple rounds. The trigger, hammer and disconnector are all original. I’m using the JP spring kit in the gun but have never had a problem with these before. The disconector is grabbing the hammer and releasing it just exactly the way it is supposed to. Is it possible that the bent case is protruding enough to allow the free floating firing pin to set these things off all by its self? I've seen primer dings on unfired cartridges I've manually ejected before. Sombitch that was thrilling! One more reason to be sure you’re always pointing that thing in a safe direction, eh? |
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If your going to chamber a round, you really need to ride the charging handle down and finish loding the bolt the the FA. But since I have been known to load single from a sled (hitting the release and lettng the bolt free run), You may have a problem with the trigger primary sear (front one) to the hammer sear. With the rifle unloaded, let the carrier fly home and see it the hammer is still on the trigger sear (just pull the trigger after the bolt slams home). If the hammer is being danced off the front trigger sear, it's time for a new FCG (either it's worn or set too light if it was stoned). |
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It could be a slam fire but I doubt it. The design of the AR is such that the bolt must be locked for any firing pin protrusion. A short bolt carrier or long firing pin could allow for protrusion but this is unlikely because both would result in primer rupture. I put all guesses on the trigger group. The bolt closing was delayed causing the disconnector to miss engaging and allowing the trigger to slip. JP's with their overtravel limits have a weak disconnector engagement. Check the disconnector spring. |
It's the original with less than 500 rounds through it. I'm getting light primer strikes on cartridges that I'm ejecting manually. I've seen this before but never gave it much concern but now I'm wondering if this has something to do with it. |
He is not touching the trigger during loading, the disco is not in play. But in regards to the JP springs, reinstall the springs that came with the old FCG. You maybe getting trigger dance on the carrier slaming home, caused by a light trigger spring. |
I've never heard of that before. They always said don't ride it. BM Manual page 41 I've never had a slam fire even with .223 REM ammo with soft primers.
Good idea. Do a complete function test while your at it. Shok |
It's also a great way to over-stress and mess up the extractor. ETA - that is, letting the bolt slam into the back of a chambered round |
Oh I didn't think of that, your absolutely correct. I never thought of a scenario where you close the bolt on a chambered round since I never do it.  Thanks, Shok |
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